David,
When I provide EnABL'd drivers to folks wanting 40 to 60 db down in coherent information, below the typically available 40 db down, I do provide partial GC's attached directly to the drivers. These are not intended to provide all of the benefit of a full on Ground Control, as is available commercially. Primary function is to make certain that the driver has access to the back half of the wave form for information that provides spatial clues and removes the starved, sick sound, of densely recorded material, when the ground side is starved of carrier electrons. These GC's typically do not have cotton sleeves or attachment lugs and as Jejaudio has pointed out, both of these are important portions of the GC approach to information retention.
Just attaching a piece of wire, in a loop will likely have some effect. Not necessarily a positive effect, but for proof of principle it should show that while somewhat silly, the concept does work. I would suggest a 2 foot long piece of lamp cord, split into two pieces. Strip about an inch of insulation off of both ends of one piece, make a loop and twist the wires together. Insert this section of bare wire into your speaker box lug connection, on the return side, black, connector. Do the same for the other side. Then sit back and listen carefully as the wire begins to alter what you hear. I doubt you will like it initially. A few hours into listening, not necessarily all at one sitting by any means, remove the wires and listen for a short period, then reattach them and listen again. I am pretty sure you will "get it".
The GC is a carefully controlled "generalist" tuning of what you will find in the lamp cord loop. It is aimed at the sweet spot for the vast majority of speakers and electronics and while they can be further refined for a specific system, it is an agonizingly tedious business and most often well into the "placebo" realm of wished for improvements. The commercial versions will provide you with more than you hoped for. And, until you delve into EnABL'd drivers, a very clear improvement in tonal richness, transient correctness, tonal vividness and coherent information, that allows your brain to reconstruct the space that the sonic event occurred within.
EnABL'd drivers will respond just as stock ones will, but a specific set directly on the drivers, will add even more to what the commercial units bring.
Bud
